Regular Expressions 101

Explanation

Pro

Group 1([S].+)

Character Class[S]

Sthe literal S (83₁₀ / 123₈ / 53₁₆) (case sensitive)

.+any character (except for line terminators), repeated at least once

Positive Lookahead(?=, [^S])

, the literal text ,

Negated Character Class[^S]

Sthe literal S (83₁₀ / 123₈ / 53₁₆) (case sensitive)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

([S].+)(?=, [^S])

New

(Last name) (First name)
Duncan, Jean
Schmidt, Paul
Sells, Simon
Martin, Jane
Smith, Peter
Stephens, Sheila
Schmidt, P 
Smith, P

(Last name) (First name)
Duncan, Jean
Schmidt, Paul
Sells, Simon
Martin, Jane
Smith, Peter
Stephens, Sheila
Schmidt, P 
Smith, P